package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.ArrayList;
import java.util.List;

@Slf4j
@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品
     */
    @Override
    @Transactional //因为需要同时插入两张表，需要开启事务
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表中添加1条数据
        dishMapper.insert(dish);
        Long dishId = dish.getId();

        //向口味表中添加多条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            //批量赋值id
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            //批量插入
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     */
    @Override
    public PageResult<DishVO> pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult<>(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //1.判断当前菜品是否在起售中（存在一个就抛异常）
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == 1) {
                //表示当前为起售状态抛异常
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //2.判断当前菜品是否在套餐中
        List<Long> setmealIds = setmealMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && !setmealIds.isEmpty()) {
            //表示当前菜品在套餐中，抛异常
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //3.删除口味表中的数据和菜品中的数据
        for (Long id : ids) {
            //删除菜品表
            dishMapper.deleteById(id);
            //删除口味表
            dishFlavorMapper.deleteByDishId(id);
        }
    }

    /**
     * 根据id查询菜品
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //查询菜品数据
        Dish dish = dishMapper.getById(id);

        //查询口味数据
        List<DishFlavor> dishFlavorList = dishFlavorMapper.getByDishId(id);

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavorList);

        return dishVO;
    }

    /**
     * 修改菜品
     */
    @Override
    @Transactional
    public void update(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //1.修改菜品表
        dishMapper.update(dish);

        //2.修改口味表
        //2.1 删除口味表
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //2.2 新增口味表
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            //批量赋值id
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            //批量插入
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据分类id查询菜品数据
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 启售停售菜品
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }
}
